Kabushiki Kaisha Toshiba

Yu Yu

Yoshimichi Tanizawa

Ririka Takahashi

Yasuhiro Katsube

Suh Wuk Kim

Yasuhiro Fujiyoshi

A key management device according to an embodiment is for managing an application key used for encrypting communication of a user network including cryptographic applications. The key management device includes a plan acquisition unit, a plan execution unit, a communication unit, and a provision unit. The plan acquisition unit acquires a key distribution plan formulated based on state information indicating a state of the user network. The plan execution unit determines a distribution amount of the application key for each key sharing destination corresponding to a destination cryptographic application based on the key distribution plan. The communication unit encrypts the application key using a link key generated by QKD, and transmits the encrypted application key to the key sharing destination. The provision unit provides the application key in response to a request from the cryptographic application.

Key management device, quantum cryptography communication system, and program

A key management device according to an embodiment is a key management device managing an application key for encrypting a communication in an application network including a plurality of applications. The key management device includes a hardware processor configured to function as a collection unit, a calculation unit, a determination unit, and a communication unit. The collection unit collects, using quantum key distribution (QKD), resource information indicating a resource of a link for which a link key is generated. The calculation unit calculates metric for a key relay route including the link on the basis of the resource information. The determination unit determines a key relay route from among a plurality of key relay routes on the basis of the metric. The communication unit uses the key relay route determined by the determination unit to send, to a destination, an application key encrypted with the link key.

Key management device, quantum cryptography communication system, and computer program product

A radio communication system according to an embodiment includes a plurality of radio devices constituting a multi-hop network. The radio devices each include a hardware processor and perform management by synchronizing a timing of an uplink period including X frames and a timing of a downlink period including Y frames. X and Y are different values. The radio devices each allocate the hop count of each radio device of the plurality of radio devices to at least one frame in the uplink period and at least one frame in the downlink period. The radio devices each transmit uplink data in the frame to which the hop count of the own radio device is allocated in the uplink period. The radio devices each transmit downlink data in the frame to which the hop count of the own radio device included in the downlink period is allocated.

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Kawasaki Kanagawa, Japan

Yu Yu